Help me choose a new IEM as a 2nd pair to my K3003.

I've got a budget of around £350/400 for new Iem's. They will be a 2nd pair to my Akg k3003 but they will get a lot of use.
Not expecting to surpass the sq of the 3003.
In the past ive had a good mixture of iems from etys to w4 etc.
So far ive looked at importing the jvc fx850 or trying one of the quad ba iems.
Will be using dx90 or Galaxy S5/Fiio e18 as source.